“Paul” may be a buddy sci-fi adventure film involving a wise alien in need of a little help from two cross-country trekking British geeks, but the movie, which hits theaters on Friday, packs in a lot of leading ladies – including Sigourney Weaver, Kristen Wiig, Blythe Danner and “Glee” titan Jane Lynch (in a push-up bra).

“It was difficult, you know, just the machination of it,” “Paul” star Nick Frost told Access Hollywood during the movie’s press junket in Rachel, Nevada — eight miles away from the Area 51 entrance — of getting Jane in the cleavage boosting contraption.

Simon Pegg, who plays Graeme, one of the two Brits trying to help the alien in “Paul,” told Access that when they recruited Jane to play Pat, a character based on a real life owner of the Little A’le’Inn – a diner and alien-fanatic hotspot, located off a Nevada road nicknamed the “Extraterrestrial Highway” — it was before she found superstar crossover success with “Glee.”

“When we shot this, she’d shot ‘Glee,’ Series 1, but it wasn’t out yet, so it was pre-‘Glee,’ it was a pre-‘Glee’ Jane,” Simon, who co-wrote the film with Nick, said. “She was pre-Sue [Sylvester]… and Jane is like the opposite of Sue Sylvester in real life. She’s the nicest, sweetest person, and she has that wonderful, acerbic edge, but it’s all done for good.

“She was excited though ‘cause it was like, ‘I’ve got this show coming out,’ and we’re like, ‘Tell it to the birds because we’re making a movie!’ And then we just kicked her out after that,” Simon laughed of Jane’s cameo.

In the adventure film, Simon’s character, Graeme, and Nick’s character, Clive, have to help out Paul, a CGI alien voiced by Seth Rogen, who is on the run from Jason Bateman (Agent Zoil), Sigourney (The Big Guy), Bill Hader (Haggard) and Joe Lo Truglio (O’Reilly). In the film, Nick had to get up close and personal with sci-fi babe Sigourney and apparently, she opted for some real method acting on set.

“She’s very hands on,” Nick said. “I had to bite her in the film and I was a bit nervous of doing that and I nibbled and she said, ‘No, bite me!’”

Another lady the lads swooned over on director Greg Mottola’s set was Blythe, who plays Tara Walton, the older version of a young girl who encounters Paul in an early scene from the film. Simon said his pal Gwyneth Paltrow, Blythe’s daughter, was instrumental in getting the celebrated actress on board.

“We always kind of figured Blythe for Tara, who is this slightly kind of isolated older lady who’s been living on her own for a long time, ‘cause Blythe has this wonderful — she can play batty very well,” Simon said. “I kind of know Gwyneth socially, so I was able to say, ‘Tell your mum to read this!’ And thank goodness she said yes. And we love Blythe, she was like our on set mum.”

“She gives a wicked back rub on set,” Nick added.

“Paul” opens everywhere on Friday.

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